[clang-tools-extra] [clang-tidy] Fix readability-simplify-boolean-expr for init statements (PR #172220)

[Baranov Victor via cfe-commits]

================
@@ -1,19 +0,0 @@
-// RUN: clang-tidy %s -checks='-*,readability-simplify-boolean-expr' -- -std=c++17 | count 0
-struct RAII {};
-bool foo(bool Cond) {
-  bool Result;
-
-  if (RAII Object; Cond)
-    Result = true;
-  else
-    Result = false;
-
-  if (bool X = Cond; X)
-    Result = true;
-  else
-    Result = false;
-
-  if (bool X = Cond; X)
-    return true;
-  return false;
-}
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vbvictor wrote:

Do any of these cases now pass?
If so we should add them to existing test cases. If not - leave as is.

https://github.com/llvm/llvm-project/pull/172220